Heater



FIG. 1 is a front perspective view of the heater;

FIG. 2 is a rear perspective view of the heater;

FIG. 3 is a rear view of the heater;

FIG. 4 is a top view of the heater;

FIG. 5 is a left side view of the heater;

FIG. 6 is a front view of the heater;

FIG. 7 is a right side view of the heater; and,

FIG. 8 is a bottom view of the heater.

The broken lines are for environmental purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a heater, as shown. 